Feed mechanism for sewing-machines.



PATENTED SEPT. 27, 1904.

' 0. BRADLEY.

FEED MECHANISM FOR SEWING MACHINES.

APPLICATION FILED FEB-12, 1903.

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No. 771,010. PATENTED SEPT. 27, 19104; C. E. HADLEY.

FEED MECHANISM FOR SEWING MACHINES. APPLIOATION FILED $1128.12. 1903.

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PATENTED SEPT. 2'7, 1904.

0. E. HADLEY.

FEED MECHANISM FOR SEWING MACHINES.

APPLICATION FILED FEB. 12, 1903.

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N0 MODEL.

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UNITED STATES Patented September 27, 1904.

PATENT OFFICE.

FEED MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 771,010, dated September 27, 1904.

Application filed February 12, 1903. Serial No. 143,058. (No model.) I

To all whom it may concern:

Be it known that 1, GHARLEs E. HADLEY, a citizen of the United States of America, and a resident of Chicopee, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Feed Mechanism for Sewing-Machines, of Which the following is a full, clear, and exact description.

The object of this invention is to provide an improved feed mechanism which includes a feed-dog mounted for movement on the table and adjustable so as to take a firmer or looser grip, as desired, on the material to be sewed, this action depending upon the normal position of the teeth above the table, while proper vertical and longitudinal movement is imparted to said dog by a single eccentric on the main driving-shaft, and all as will be hereinafter described, and pointed out in the claim. In the accompanying drawings, in which similar characters denote similar parts, Figure 1 is a side view of a machine embodying my invention. Fig. 2 is a top view thereof, partly broken away to disclose the interior. Fig. 3 is a partial end view of the machine looking from the right of Fig. 1. Fig. 4 is a vertical cross-section through the table. Fig. 5 is a central section of the eccentric for operating the feed mechanism, and Fig. 6 is a front view thereof looking from the right of Fig. 5.

Referring to the drawings, 20 denotes a suitable frame having bearings 21 22 for supporting the main driving member or shaft 23, on which the several actuating devices of the machine are mounted and which may be operated from a band-wheel 24 in any convenient manner. The table is, as has been above mentioned, mounted for movement relative thereto, it being preferably provided with an arm 31, the'rear end of which may be pivotally supported, as at 32, on the frame, while a direct support is afforded to the table by a spring 33, interposed between the head 3 of a bolt 35 and a washer 36, through which said bolt may loosely pass and which in turn is supported by a projection 37, provided therefor on the frame 20. The upward movement of the table may be limitedas, for instance, by a nut 38 in screw-threaded engagement with the bolt 35 and adapted to come into contact with the lower surface of the projection 37, above referred to.

The feed mechanism which I preferably employ in connection with my present machine is clearly illustrated in Figs. 1, 3, and 4 of the drawings and comprises a feed-dog 50, the cloth-engaging teeth of which have a vertical as well as a longitudinal movement relative to the stationary presser-foot P. The longitudinal movement of the feed-dog is in the present instance dependent upon the movement of a slide 51, on which said feed-dog is pivotally supported, as at 52, and which is guided by a bracket 53, secured upon the under side of the table Tas, for instance, by a screw 54:. Reciprocatory movement is imparted to the slide 51 by a lever 55, constituting a link between said slide and an actuating member consisting substantially of an eccentric 56, mounted upon the shaft 23 and comprising a cylinder member 57, the axis of which is disposed at an angle with that of the driving-shaft 23, as clearly shown in Fig. 1. The cylindrical member 57 is fast to and driven by the driving-shaft. Surrounding part 57 is a sleeve '58, loosely fitted for free rotation relatively The periphery of sleeve 58 is spherthereto. ical, so as to allow a manner of universal-joint action. 59 is a case having a socket into which spherical sleeve 58 is fitted to freely move and which carries a spline preventing rotative motion of the sphere concentric with the driving-shaft axis; but the sphere has rotative movement on an axis (in a horizontal plane) perpendicular to the driving-shaft axis. On the exterior of the socketed case are provided ways to allow the approximately vertical adjustment of the yoke 65, which is fastened by set-screws 75, Fig. 1, which adjustment regulates the throw of the feed-dog 50. As the distance of pin 66 from center of driving-shaft 23 is increased it will be seen that the wabbling effect will be correspondingly increased. As the only motions which this wabbling eccentric is called upon to perform are a reciprocatory vertical and a horizontal reciprocatory motion, the lateral throw of the eccentric is neutralized or rendered non-eflective by the provision of duplicate studs 66 66, fast to the yoke 65 and free to slide in the endsof the bifurcated or bowed part 55. Thus the lever has a movement in a vertical plane imparted thereto from a shaft parallel therewith by the interposition of the wabbling eccentric device just above described, which movement of the lever is approximately a motion in which the longitudinal and vertical effects are properly alternated to give the required motions to the feed-dog.

The strap 65 of the eccentric carries one end of the link 55, which is pivoted thereto at 66, while the other end of said link is preferably secured to the free end of an arm 67, normally rigid 011 the slide 51, but adapted for adjustmentas, for instance, by a screw 68 so as to vary the position of the slide relatively to the actuating-point 66 and in this manner controlling the longitudinal working position of the feed-dog 50 relative to the path of the needle to avoid interference in the operation of these elements. This term varying the longitudinal working position implies a variation of the location of the feeddog movement so as to terminate at any desired distance from the needle, but without altering or interfering with the amount of the feed movement after it has been once set for a certain stitch. Since the strap 65 imparts a vertical movement to the point 66 as well as a longitudinal movement, the link 55 is provided with an extension 55 in order to take advantage of this movement for operating the feed-dog in a vertical plane and in the required manner, the endof the extension 55 being connected by a link 69 with the rearward extension 50 of the feed-dog 50.

lVIeans are provided whereby the working position of vertical movement of said feed-clog may be varied so as to take a firmer or looser hold upon the under side of the material to be sewed, and for this reason the link 69 is slotted, as shown at 69, to permit the dog 50 to be oscillated for adjustment in a vertical plane without in any way altering the amount of vertical movement thereof during its regular operation.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

In a feed mechanism for a sewing-machine, the combination, with a feed-dog, a drivingshaft, and a lever arranged substantially parallel with said shaft and operatively connected to the dog, of means for imparting rocking motion from the rotary shaft to said lever, and consisting of a cylindrical member eccentrically mounted on the shaft, a spherical sleeve loosely surrounding said cylindrical member, a case fitted about said sleeve and spline engaged therewith, a yoke in engagement with the case and vertically operable thereby, and means for variably positioning said yoke on said case.

Signed by me in presence of two subscribing witnesses.

CHARLES E. HADLEY. Witnesses:

ANDREW T. DALY, JosErH V. K. NOLAN. 

